.

35mm focal lengthUsing DiagonalUsing Short SideUsing Long SideRatio Step

.

21748370

.

351241391171.67

.

501771981671.43

.

903193563001.80

.

1354785354501.50

.

.

.

%ge of ratio

.

953.7493.501.26

.

1204.7294.49

.

Calculating diagonal size / NB: 4x5 isn't 4x5

.

.

24x3695x120 (4"x5")These are the ratios of 35mm to LF depending on whether we use diag, short or long aspect

.

Diagonal (mm)Diagonal (mm)

.

SQRT(24^2+36^2)SQRT(95^2*120^2)Calc Ratio Diag.Calc. Ratio ShortCalc, Ratio Long

.

43.27153.050.280.250.30

.

3.543.963.33

.

6x17 film6x7 film

.

180.27756377319992.1954445729289

.

ratio of 6x17 diag to 6x7 diag

.

1.95538472218761